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oxm_fields: Update comment for the new version of EXT-256

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Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
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YAMAMOTO Takashi 2015-02-06 16:33:51 +09:00 committed by FUJITA Tomonori
parent ef0c72c5bf
commit ee0c84be6a
1 changed files with 17 additions and 7 deletions
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24
ryu/ofproto/oxm_fields.py
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@ -24,7 +24,7 @@
# value and mask are on-wire bytes.
# mask is None if no mask.
# There are three type of OXM/NXM headers.
# There are two types of OXM/NXM headers.
#
# 32-bit OXM/NXM header
# +-------------------------------+-------------+-+---------------+
@ -37,18 +37,28 @@
# +-------------------------------+-------------+-+---------------+
# | experimenter ID |
# +---------------------------------------------------------------+
# NOTE: EXT-256 had a variation of experimenter OXM header.
# It has been rectified since then. Currently this implementation
# supports only the old version.
#
# ONF EXT-256 style experimenter OXM header
# ONF EXT-256 (old, exp_type = 2560)
# +-------------------------------+-------------+-+---------------+
# | class (OFPXMC_EXPERIMENTER) | ????? |m| length |
# +-------------------------------+-------------+-+---------------+
# | experimenter ID (ONF_EXPERIMENTER_ID) |
# +-------------------------------+-------------------------------+
# | exp_type |
# +-------------------------------+
# +-------------------------------+---------------+---------------+
# | exp_type (PBB_UCA=2560) | pbb_uca |
# +-------------------------------+---------------+
#
# Note: According to blp@nicira, EXT-256 will be rectified.
# https://www.mail-archive.com/dev%40openvswitch.org/msg37644.html
# ONF EXT-256 (new, oxm_field = 41)
# +-------------------------------+-------------+-+---------------+
# | class (OFPXMC_EXPERIMENTER) | PBB_UCA=41 |m| length |
# +-------------------------------+-------------+-+---------------+
# | experimenter ID (ONF_EXPERIMENTER_ID) |
# +-------------------------------+---------------+---------------+
# | reserved, should be zero | pbb_uca |
# +-------------------------------+---------------+
import itertools
import struct